Amphora bigibba var. interrupta (Grunow) Cleve, 1895

Joh, Gyeongje, 2021, Distribution and frequent occurrence of diatom taxa (Bacillariophyta) inhabiting warmer oceans in Seogwipo coast of Jeju Island, southernmost Korea, Phytotaxa 517 (1), pp. 1-67 : 36-38

59. Amphora bigibba var. interrupta (Grunow) Cleve ( Figs 121, 122 )

Basionym: Amphora binodis var. interrupta Grunow.

Type locality: Campeche Bank .

References: Witkowski et al. 2000, p. 131, pl. 163, figs 27–30; Wachnicka & Gaiser 2007, p. 414, figs 84, 95.

Morphometrics: Valves 28–40 (20–46) μm long, 5–6 (5–7) μm wide, and transapical striae 20–22 (21–25) in 10 μm.

Remarks: No transapical striae exist on valve in the middle dorsally. Amphora bigibba var. interrupta is widespread along the coasts of warmer oceans ( Witkowski et al. 2000), the Florida Bay ( Wachnicka & Gaiser 2007), the Bahamas ( Hein et al. 2008), the coast of Thailand ( Kokociński et al. 2009), and the coast of Baja California Peninsula of Mexico ( Siqueiros-Beltrones & Argumedo-Hernández 2015). This taxon is also a subtropical taxon found in the warmer oceans as the nominate variety, Amphora bigibba . It was rarely epiphytic along the Seogwipo coast in Jeju Island, and represents a new record for South Korea.

Figures

FIGURES 121–134. Diatom taxa of Seogwipo coast in Jeju Island (13). Figs 121, 122. Amphora bigibba var. interrupta. Figs 123, 124. A. staurohyalina. Figs 125, 130. Nitzschia marginulata var. didyma. Figs 126, 127. Seminavis cf. pusilla. Figs 128, 129. Nitzschia composita. Figs 131, 132. Seminavis latior. Fig. 133. Tetramphora intermedia. Fig. 134. T. decussata. Scale bars = 10 μm.